Derivatives (Details 4) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Cash Flow Hedging [Member]
Amount of Loss or (Gain) Reclassified from AOCI into Income (Effective Portion):
Effective portion	$ 7.9		$ (9.6)		$ (8.8)
Cash Flow Hedging [Member] | Cost of Goods Sold [Member] | Commodity Futures Contracts [Member]
Amount of Loss or (Gain) Reclassified from AOCI into Income (Effective Portion):
Effective portion	6.0	[1]	(12.1)	[1]	(11.2)	[1]
Cash Flow Hedging [Member] | Interest Expense Net [Member] | Interest Rate Swap [Member]
Amount of Loss or (Gain) Reclassified from AOCI into Income (Effective Portion):
Effective portion	1.9	[2]	2.5	[2]	2.4	[2]
Cash Flow Hedging [Member] | Losses and Other Expenses Net [Member] | Commodity Futures Contracts [Member]
Amount of (Gain) or Loss Recognized in Income on Derivatives (Ineffective Portion):
Ineffective portion	(0.1)	[3]	0.1	[3]	(0.4)	[3]
Not Designated as Hedging Instrument [Member]
Amount of (Gain) or Loss Recognized in Income on Derivatives:
Amount of (Gain) or Loss Recognized in Income on Derivatives	(0.1)		3.8		(1.9)
Not Designated as Hedging Instrument [Member] | Losses and Other Expenses Net [Member] | Commodity Futures Contracts [Member]
Amount of (Gain) or Loss Recognized in Income on Derivatives:
Amount of (Gain) or Loss Recognized in Income on Derivatives	(0.5)	[3]	3.5	[3]	(1.7)	[3]
Not Designated as Hedging Instrument [Member] | Losses and Other Expenses Net [Member] | Foreign Currency Forward Contracts [Member]
Amount of (Gain) or Loss Recognized in Income on Derivatives:
Amount of (Gain) or Loss Recognized in Income on Derivatives	$ 0.4	[3]	$ 0.3	[3]	$ (0.2)	[3]

[1] The loss (gain) is recorded in Cost of goods sold in the accompanying Consolidated Statements of Operations.

[2] The loss is recorded in Interest expense, net in the accompanying Consolidated Statements of Operations.

[3] The (gain) loss is recorded in Losses and other expenses, net in the accompanying Consolidated Statements of Operations.